The Chelberg Family Farmhouse was built in 1885 by a Swedish immigrant family after a fire destroyed the family's wooden farmhouse. (Bob Downing/Akron BeaconJournal)

The sandy beaches on Lake Michigan are popular with swimmers and sun bathers in the summer. Some of the beach sands can, when conditions are right, produce musical notes when you walk on the sand. (Bob Downing/Akron BeaconJournal)

Hikers can ascend and descend the towering sand dunes on the flanks of Mount Baldy in northern Indiana. (Bob Downing/Akron BeaconJournal)

Mount Baldy stands at the eastern end of the Indiana Dunes National Lakeshore east of Gary, Ind. (Bob Downing/Akron BeaconJournal)

Marram grass is the key to keep sands from blowing away. It sends deep roots into the sand to hold it in place. (Bob Downing/Akron BeaconJournal)

Sign warns park visitors that sections of the dunes are closed to protect and restore the sand dunes. (Bob Downing/Akron BeaconJournal)

Trees are buried in sand at Mount Baldy at Indiana Dunes National Lakeshore as the dunes move inland. (Bob Downing/Akron BeaconJournal)